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Impacts of intraseasonal oscillation on the onset and interannual variation of the Indian summer monsoon

chinese Science Bulletin 2009年第5期54卷 880-884页

作者： qi yanjun {2. renhe li tim wen min institute of atmospheric {2. Chinese Academy of Sciences Beijing 100029 China State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing 100081 China Graduate University of the chinese academy of sciences Beijing 100049 China International Pacific Research Center and Department of Meteorology University of Hawaii at Manoa Honolulu 96816 HI USA

The role of the intraseasonal oscillation (ISO) on the seasonal and interannual variations of the Indian summer monsoon is investigated based on the analysis of observational data. It is shown that the ISO significantly contributes to the establishment of low-level westerlies during the monsoon onset and developing periods. The effect of the ISO on the annual cycle of the monsoon is through nonlinear eddy momentum transport. On the interannual timescale, the Indian summer monsoon rainfall exhibits a significant out-of-phase relationship with the ISO intensity over the Indian monsoon region. In strong ISO years it appears the weak monsoon when there is an abnormal high over the India subcontinent in the lower troposphere. In weak ISO years there exists an abnormal low and the strong monsoon ap-pears.

关键词：大气季节震荡印度洋夏季季风年际变化

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Boreal Summer Intraseasonal Oscillation in the Asian–Pacific Monsoon Region Simulated in CAMS-CSM

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Journal of Meteorological Research 2019年第1期33卷 66-79页

作者： yanjun qi {2. zhang Xinyao RONG Jian li Lun li State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesChina Meteorological Administration institute of atmospheric {2. Fudan University

The boreal summer intraseasonal oscillation(BSISO) is simulated by the Climate System Model(CSM) developed at the chinese {2. of Meteorological sciences(CAMS), china Meteorological Administration. Firstly, the results indicate that this new model is able to reasonably simulate the annual cycle and seasonal mean of the precipitation, as well as the vertical shear of large-scale zonal wind in the tropics. The model also reproduces the eastward and northward propagating oscillation signals similar to those found in observations. The simulation of BSISO is generally in agreement with the observations in terms of variance center, periodicity, and propagation, with the exception that the magnitude of BSISO anomalous convections are underestimated during both its eastward propagation along the equator and its northward propagation over the Asian–Pacific summer monsoon region. Our preliminary evaluation of the simulated BSISO by CAMS-CSM suggests that this new model has the capability, to a certain extent, to capture the BSISO features, including its propagation zonally along the equator and meridionally over the Asian monsoon region.

关键词： CAMS-CSM boreal summer intraseasonal oscillation(BSISO) Asian–Pacific summer monsoon region

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Impacts of intraseasonal oscillation on the onset and interannual variation of the Indian summer monsoon

Impacts of intraseasonal oscillation on the onset and intera...

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“2.10年北京气象学会中青年优秀论文评选”学术研讨会

作者： qi yanjun~(1,2.3),zhang renhe~(2.),{2.,chinese academy of sciences,Beijing 10002.,china 2.State Key Laboratory of Severe Weather,chinese academy of Meteorological sciences,Beijing 100081,china 3 Graduate University of the chinese academy of sciences,Beijing 100049,china 4 International Pacific Research Center and Department of Meteorology,University of Hawaii at Manoa,Honolulu 96816,HI,USA

The role of the intraseasonal oscillation(ISO) on the seasonal and interannual variations of the Indian summer monsoon is investigated based on the analysis of observational *** is shown that the ISO significantly contributes to the establishment of low-level westerlies during the monsoon onset and developing *** effect of the ISO on the annual cycle of the monsoon is through nonlinear eddy momentum *** the interannual timescale,the Indian summer monsoon rainfall exhibits a significant out-of-phase relationship with the ISO intensity over the Indian monsoon *** strong ISO years it appears the weak monsoon when there is an abnormal high over the India subcontinent in the lower *** weak ISO years there exists an abnormal low and the strong monsoon appears.

关键词： intraseasonal oscillation(ISO) Indian summer monsoon interannual variation

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